<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <meta http-equiv="X-UA-Compatible" content="ie=edge">
    <title>Document</title>
    <script src="../vue.js"></script>
</head>

<body>
    <div id="app">
        <select @change="selectedOne">
            <option :selected="like.includes('唱')" value="唱">唱</option>
            <option :selected="like.includes('跳')" value="跳">跳</option>
            <option :selected="like.includes('rap')" value="rap">rap</option>
            <option :selected="like.includes('篮球')" value="篮球">篮球</option>
        </select>
        <p>{{like}}</p>
    </div>
    <script>
        const app = new Vue({
            el: '#app',
            data: {
                like: '篮球'
            },
            methods: {
                selectedOne(e) {
                    this.like = e.target.value
                }
            }
        })
    </script>
</body>

</html>